Air-pump



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AIR PUMP.

' APPLICATION FILED JAN. 2.1919. 1,328,529, Patented Jan. 20,1920.

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CHARLES G, LILLOS, 0F MINNEAPOLIS, MINNESOTA.

AIR-PUMP.

Specification of Letters Patent.

- Patented Jan. 20, 1920.

Application filed January 2, 1919. Serial No. 269,230;

To all whom-it may concern:

Be it known that I, CHARLES G. LILLos, residing at 811 8th Av. So., Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements in Air-Pumps, of which the following is a specification,

This invention relates to improvements in air pumps and more particularly to pumps used for inflating automobile tires and the like.

The invention has for its object to pro- Vide, in a device of the class described, adjustable and collapsible supporting and actuating parts permanently attached to the main frame, to form a compact unit when not in use.

A further object of the invention is to provide novel pump actuating means enabling application of power directly to the pistons, the power residing in the weight of the operator.

The invention consists in the construction, combination and arrangement of parts hereinafter described and claimed.

Referring to the drawings;

Figure 1, is a perspective view of the invention.

Fig. 2, is a side elevation of the major portion of the frame partly in section.

Fig. 3, is a vertical section on line 33 of Fig. 2.

Fig. 4, is a horizontal section on line M of Fig. 2 showing the discharge conduits for the cylinders.

Fig. 5, is a perspective view of top of one of the legs and its socket in the frame.

Fig. 6, is a fragmentary view of one of the foot plate guides.

Fig. 7, is a side view of.one of the leg supports in folded position.

- ig, 8, is a vertical sectional view through a piston.

Fig. 9, is alongitudinal sectional view on.

line 9-9 of Fig. 4:, and

Fig. 10, is a side view of a'modified form of the invention.

In the drawings, A represents cylinders adapted to slidingly receive pistons B mounted on piston rods 1 which latter rigidly support at the upper ends the footplates or treads 2.

The cylinders are shown grouped in pairs, one pair for each tread, and are secured to the top plate 3 and the base plate 4:, said I plates being further held positioned by the vertical stay rods 5.

The top plate is perforated with T shaped openings 6 adapted to slidingly receive the legs 7 which latter are formed with a pair of oppositely disposed notches, 8, to form a narrow neck, so that the leg may be inserted into the wide portion of the opening 6 and then moved to allow the neck to enter the narrow portion of said opening.

A link 9 has pivotal connection with the leg near the lower end thereof, and with a clip 9 surrounding the rod 5 and slidable thereon so that when the clip is slid upwardly the leg maybe projected through the top plate, the entire leg support assuming the folded position illustrated in Fig. 7

The legs of which there are three are disposed when in use at an angle directed downwardly and outwardly, to secure a comparatively large footing.

The cylinders are provided with the usual air intake 10 and check valves 11 the latter being arranged in the discharge conduit 12 leading to the discharge nozzle '13 to which is attached the usual hose as may be required.

The cylinders are spaced on the top and base plates, the top plate having two downwardly projecting lugs 14 between each pair of cylinders said lugs notably supporting rotatably idler pulleys 15, a cable 16 running over said pulleys, the latter being arranged so as to bring said cable central between each pair of cylinders.

Each end of the cable is attached to a guide 17 slidable over the outer walls of the cylinders, the guides and treads being connected by the rods 18, which pierce the top plate and slide therein.

Thus, when one tread together with its pistons to which it is connected is moved to its lowermost position (Fig. 3) the other tread and its pistons will be lifted through the medium of the cable 16 to its uppermost position.

The user standing with one foot on each tread (the treads conforming to the sole of the foot) and alternately balancing himself on one tread and then the other. thereby alternately expels the air from each pair of cylinders.

While I have shown four cylinders in the drawings, the principle of operation of the invention may be applied to two cylinders as shown in Fig. 10.

The guides17 (Fig. 6) are formed with curved outwardly extending members adapted to slidingly embrace the cylinders.

and with a central opening or slot 19' to receive the cable 16 the latter being secured, (on one of the guides) on the pin 20. The other guide is formed with a side opening 21 communicating with the slot 19, the walls of the slot having a semicircular recess 22 wherein snugly fits a ring 23 attached to the other end. of said cable. The slot isof lesser width than the thickness of the ring, the latter abutting against the shoulder of the recess by the upward pull on the cable caused by the weight of the tread and the parts connected thereto.

When it is desired to disassemble the device, the ring 23 is dislodged from the recess by pulling it down (Fig. 3), when the treads can be let down to their lowermost position.

The legs are then folded as hereinbefore explained.

1. In-an air pump comprising two pairs of spaced vertical cylinders connected together by a top plate and having conduits for delivering compressed air, a'reciprocatory piston rod for each cylinder extending beyond the top thereof, a foot treadfor each pair of cylinders secured to the top of the piston rods and bridging the space between the cylinders, a guide. member on each pair of cylinders adapted to slide vertically in the space between them, a rotatable pulley for each tread mounted on the under side of the top plate between the cylinders, a cable with the guide between its respective cylinders.

2. A device of the class described, comprising two pairs of spaced cylinders, a

horizontal top; plate secured to the cylinders through, and having notches near its top to interlock with the top plate in said openings, and a link for each leg slidable on said rod and pivotally connected to the leg for the purpose set forth.

3. In an air pump, comprising a horizontal top plate and a bottom plate parallel therewith, two pairs of vertical cylin-dersbetween the plates, a compressed air discharge conduit for the cylinders, piston rods for the cylinders extending through and beyond the top plate, a tread mounted on the piston rods of each pair of cylinders, see-saw connections between the treads, a plurality of holes in the top plate, a leg for each hole, each leg being projectable through the top plate and having notches near its'upper end to embrace the edge of the top plate in its respective hole, and pivoted supporting means slidably connectingthe leg with said top and bottom plates.

In testimony whereof I aflix my signature in presence of two Witnesses.

CHARLES G. LILLOS;

Witnesses:

GEORGE VoELKER, EFFIE JoHNsoN. 

